On 03/23/2012 11:28 PM, Dan wrote:
> When would you use in / out parameters instead of ref & const keywords?
I am just about finished translating a chapter exactly on that topic.
I've just realized that I have some questions myself. :)
'out' is the equivalent of a reference in C++, with additionally
initializing the out parameter upon entry to the function.
void foo(out int i)
{
assert(i == 0); // regardless of what it was before the call
}
'in' is the same as 'const scope'. const part is easy to understand but
I don't know what 'scope' does. I could not understand what the spec
means with "references in the parameter cannot be escaped (e.g. assigned
to a global variable)" for scope:
http://dlang.org/function.html
'ref' is the same as a C++ reference.
Ali
